Unit & Measurement Converters
Convert between metric, imperial and US units instantly. Every converter uses the exact internationally defined factors, shows you the formula, and runs entirely in your browser — nothing is uploaded, ever.
Browse by measurement
- Length & Distance 10 units · 16 popular conversions
- Weight & Mass 9 units · 14 popular conversions
- Temperature 4 units · 6 popular conversions
- Volume & Cooking 13 units · 16 popular conversions
- Area 9 units · 12 popular conversions
- Speed 6 units · 9 popular conversions
- Time 10 units · 13 popular conversions
- Data Storage 10 units · 11 popular conversions
- Pressure 9 units · 8 popular conversions
- Energy 8 units · 8 popular conversions
- Power 6 units · 7 popular conversions
Most-used conversions
- Centimeters → Inches
- Kilograms → Pounds
- Celsius → Fahrenheit
- Liters → Gallons
- Square feet → Square meters
- Miles per hour → Kilometers per hour
- Minutes → Hours
- Megabytes → Gigabytes
- Pounds per square inch → Bars
- Kilocalories → Kilojoules
- Horsepower → Kilowatts
- Inches → Centimeters
Frequently asked questions
Are these unit converters accurate?
Yes. Every conversion uses the exact, internationally agreed definition of each unit (for example, 1 inch = 25.4 mm exactly and 1 lb = 0.45359237 kg exactly). Results are computed to your chosen precision with no rounding surprises.
Is anything I type sent to a server?
No. All conversions run as JavaScript in your browser. LazyTools has no conversion server — the pages even work offline once loaded.
Why use this instead of asking an AI chatbot?
Speed and reliability: the converter gives an exact, deterministic answer instantly, shows the formula, and never miscalculates. Language models can make arithmetic mistakes and are slower for a simple conversion.